Having seen the original on Broadway three times (those were the days, my friend), I have only one small quibble with the video.
One of my favorite moments in the first act finale is when the tree that George "banished" in the opening moments of the show, and that his mother keeps asking about, comes back and she sits under it with her nurse.
Due to the panning of the camera in that number, I lost one of my favorite little moments in the show.
Fortunately, the version of the finale that was broadcast on the Tony Awards that year catches it.
Aside from that, it is a treasured record of one of the greatest shows that I have ever seen.
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba